Hybrid refractive/diffractive achromatic camera lens and camera using such
First Claim
1. A consumer camera for use in visible applications comprising:
- (i) an optical system consisting of a single refractive/diffractive lens component having radii of curvature and a diffraction surface profile sufficient to achromatize said optical system over the entire visible spectrum;
(ii) a film for imaging an object by said refractive/diffractive lens component; and
(iii) a camera body enclosing said film and a portion of said refractive/diffractive lens component, wherein said hybrid refractive/diffractive lens component comprises a lens component body of optically transmissive material having an index of refraction at a wavelength approximately in the center of the visible spectrum of at least 1.45, said lens component body having first and second surfaces on opposite sides thereof, at least one of said surfaces being curved to provide a refractive portion having power and introduces chromatic aberration, said lens component having a diffractive portion having power which substantially achromatizes said lens for said chromatic aberration of said refractive portion over about 440 nm to about 650 nm, and 9<
f#;
where f# is an f-number of the optical system.
1 Assignment
0 Petitions
Accused Products
Abstract
A hybrid refractive and diffractive achromatic lens suited for single-use or inexpensive single-lens cameras operating in visible spectral range. The lens comprises a body of optically transmissive material having an index of refraction at a wavelength approximately at the center of said range of at least 1.45. The lens body having a first and second surface on opposite sides thereof, at least one of said surfaces being curved to provide a refractive portion having power and introduces chromatic aberration, the lens having a diffractive portion having power which substantially achromatizes the lens for the chromatic aberration of the refraction portion over about 440 nm to about 650 nm range.
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Citations
17 Claims
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1. A consumer camera for use in visible applications comprising:
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(i) an optical system consisting of a single refractive/diffractive lens component having radii of curvature and a diffraction surface profile sufficient to achromatize said optical system over the entire visible spectrum; (ii) a film for imaging an object by said refractive/diffractive lens component; and (iii) a camera body enclosing said film and a portion of said refractive/diffractive lens component, wherein said hybrid refractive/diffractive lens component comprises a lens component body of optically transmissive material having an index of refraction at a wavelength approximately in the center of the visible spectrum of at least 1.45, said lens component body having first and second surfaces on opposite sides thereof, at least one of said surfaces being curved to provide a refractive portion having power and introduces chromatic aberration, said lens component having a diffractive portion having power which substantially achromatizes said lens for said chromatic aberration of said refractive portion over about 440 nm to about 650 nm, and 9<
f#;
where f# is an f-number of the optical system. - View Dependent Claims (2, 3, 4)
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5. A camera for use in visible applications comprising:
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(i) an optical system comprising a refractive/diffractive lens component having radii of curvature and a diffraction surface profile sufficient to achromatize said optical system over visible spectrum; (ii) a film for imaging on an object by said refractive/diffractive lens component; and (iii) a camera body enclosing said film and a portion of said refractive/diffractive lens, wherein said film has a film portion which has a cylindrical shape. - View Dependent Claims (6, 7, 11, 12)
- 12. A camera according to claim 11, wherein
- space="preserve" listing-type="equation">9<
f#<
12
space="preserve" listing-type="equation">32<
f<
34 mm
space="preserve" listing-type="equation">1+±
32°
|<
w. - space="preserve" listing-type="equation">9<
-
-
8. A camera for use in visible applications comprising:
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(i) an optical system comprising a refractive/diffractive lens component having radii of curvature and a diffraction surface profile sufficient to achromatize said optical system over visible spectrum; (ii) a film for imaging on an object by said refractive/diffractive lens component; and (iii) a camera body enclosing said film and a portion of said refractive/diffractive lens, wherein said lens component has the radii of curvature, thickness and an aspheric profile so that,
space="preserve" listing-type="equation"><
f#<
12
space="preserve" listing-type="equation">26<
f<
34 mm
space="preserve" listing-type="equation">|±
30°
|<
wwhere f# is a f# of the lens, f is the focal lens of the lens, and w is the half field angle of the lens. - View Dependent Claims (9, 10)
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13. A consumer camera for use in visible applications comprising:
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(i) an optical system having an f-number greater than 9, said optical system comprising a single hybrid refractive/diffractive lens component having radii of curvature and a diffraction surface profile sufficient to achromatize said optical system over the entire visible spectrum said hybrid refractive/diffractive lens component comprises a body of optically transmissive material having an index of refraction at a wavelength approximately in the center of the visible spectrum of at least 1.45, said lens component body having first and second surfaces on opposite sides thereof, at least one of said surfaces being curved to provide a refractive portion having power and which introduces chromatic aberration, said lens having a diffractive portion having power which substantially achromatizes said lens component for said chromatic aberration of said refractive portion over about 440 nm to about 650 nm (ii) a film for imaging an object by said refractive/diffractive lens component; and (iii) a camera body enclosing said film and a portion of said refractive/diffractive lens component. - View Dependent Claims (14, 15, 16, 17)
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Specification